Fan.



.No. 850,609. PATENTED APR. 16, 1907.

I. WAKEFIELD.

FAN.

APPLICATION FILED DEC. 9, 1904. i v

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w b71esses 07111262 102? IMF/@6914 No. 850,609. PATENTED APR. 16, 1907.

' I. WAKEFIELD.

FAN.

APPLICATION FILED DBO. 9. 1904.

2 SHEETS-SHEET 2.

WITNESSES: [NVENTOR 1 UNITED STATES PATENT OFFICE.

ISAAC WAKEFIELD, OF NEW EAGLE, PENNSYLVANIA.

Specification of Letters Batent.

Patented April 1 1907..

Application filed Deceniber 9,190 4- Serial No. 236,217-

.To all'who ml it may concern:

I Be it known that I, ISAAC WAKEFIELD, a citizen of the United States of America, residing at New Eagle, in the county of Washington and State of Pennsylvania, have invented certain new and useful "Improvements in Fans, of which the following is a specifica tion, reference being bad therein to the accom anying drawings.

T is invention relates to improvements in fans, more particularly to the class of centrifugal fans, especially to devices of this character employed in mining and like operations, and has for one of its objects to improve the construction and increase the efficiency and utility of devicesof this character.

Another object-of this invention is to produce a device of this character by is retained in close proximity to the blades 0 thefan. Y

With these and other objects in view, whichw-ill appear as the nature of the invention is better understood, the invention consists in certain novel features of construction,

as hereafter shown, described, and specified in the claims.

, In the drawings employed for illustrating the invention is shown the approved construction capable of ca 0 eration, and in the rawings thus emp oyed Figure 1 is a perspective view, partly 1n section, of'the-improved device applie .Fig. 2 is an end elevation, enlarged, of the fan portion of the improved device. Fi 3 is a sectional elevation of theimprove device applied, the fan portionin section on the device.

line a: w of Fig. 2.

from the Fig. '5 is a sectional etail of one of the end spiders of the fan portion'of the F1g. 6 is a side elevation of one of the end lates of the fan portion of the device. Fig. 7 is a side view of one of the intermediater'plates of the fan portion of the device.

e improved device may be applied in connection with any'desired form of shell or casing and provided with a tangentially-extendingoonductor or spout, and for the pur- 4 pose of illustration an approved form of casing of this character is represented at 18, preferablyof sheet metal and with a tan- 'gentially-extending conductor 18.

The conductor 18 generally embedded in herein the air which is beingdriven or exhausted there ing the same into Fig. 44s a erspective' view of the fan-blades detached casingand arrangedin their (proper relative order.

the ground, (represented at 19,) and mount ed upon-the supporting portion 19 are bearings 20 21, sup orting a shaft 1, the shell 18 having circu ar openings 22 surrounding the shaft 1 and concentric thereto. The

shaft 1 is adapted to be rotated in any suitable manner, the rotating power not being shown, as it forms no part of the present invention.

Secured upon the shaft 1 and within the shell 18 are spider members, each comprising a gl urality of spaced, hubs 3, having radial arms 4, the arms terminating. in lateral ofl sets 4', around which annular L-shaped rings 14 are disposed and secured to the offsets as by riveting. The rings project partly through the side openings of the shell 18, as shown in 3. .Conneete to the end spiders are the end plates 10 of-the fan structure, the plates being circular exteriorly and spaced from the shell 18 and with central openings divided into a plurality of alternating pockets and radial projections, the projections corre- --sponding't o and adapted to be riveted or the forms of these end plates being repre-- which the arms are secured a binding-rin .3 Jand rivets 5, as shown in ig. 3. The en plates 10 and the intermediate plate 10' are connected by numerous curved fan-blades 6,

corresponding in number to the arms of, the

spiders, and with fianged ends 8, secured to t e several plates, as by rivets or similar'devices 9.

The fan-blades 6 extend nearty to the hubs of the spiders at their inner ed es and with theirouter edges substantially ush with-the rims of the several lates. Disposed be. tween each pair oft e main plates 6 are smaller curved auxiliary plates 15, flanged at the ends and secured by rivets or other suitable fasteners 16 to the several plates, the

. d spi ers on y,

plates and spiders, with their hubs and the shaft 1, constituting a complete and efficient The end s iders, with their hubs and arms, Will generally be of cast metal, preferably steel, and the hubs of the intermediate spider will also be preferably of cast-steel, while the remainder of the fan structure will be preferably of plate or sheet steel pressed or bent into the required shape. I

The device is simple in .construction, strong and durable, and can be inexpensivelyv manufactured, and of any required size or capacity. v

Fans of any required length may be readily constructed by simply providing a plushaft and provided with radial arms terminating in lateral offsets, annular members secured upon said offsets and having central openings, and annular end plates secured to said annular members and with radial projections within said openings corresponding to said radial arms curved primary blades extendlng between and secured thereto,

said end plates and with end flanges secured to said plates, said primary blades extendin nearly to said shaft at the inner edges, and curved auxiliary fan-blades of less width than the primary blades and having end flanges secured to said end plates.

2. In a device of the class described, a

main supporting-shaft, hubs spaced apart,

upon said shaft and provided with spaced radial arms terminating in lateral offsets, an-

nular members bearing upon said offsets and secured thereto, circular plates secured to said annular members and with central open ings and with radial projections adapted to be connected to said radial arms, an intermediate hub carried by said shaft, an intermediate plate havin concentric openings divided by spaced ra ial arms connected to said intermediate hub, a plurality of curved primar fan-blades provided with flanges secure to said end plates and to the opposite sides ofsaid intermediate plate, and curved auxiliary blades of less width than the primary blades and. disposed between each pair of the same and provided with end flanges secured respectively to said end plates and the opposite sides of said intermediate plate.

In testimony whereof I afliX my signature in the presence of two witnesses.

ISAAC WAKEFIELD.

Witnesses: 5

JOHN D. STEVENSON, RUSSIA Woons. 

